EP2438315B1 - Cavité de graissage de bielle - Google Patents

Cavité de graissage de bielle Download PDF

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Publication number
EP2438315B1
EP2438315B1 EP10722010.5A EP10722010A EP2438315B1 EP 2438315 B1 EP2438315 B1 EP 2438315B1 EP 10722010 A EP10722010 A EP 10722010A EP 2438315 B1 EP2438315 B1 EP 2438315B1
Authority
EP
European Patent Office
Prior art keywords
piston pin
recess
connecting rod
lubrication
crankshaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP10722010.5A
Other languages
German (de)
English (en)
Other versions
EP2438315A1 (fr
Inventor
Michael T. Lapp
Dan H. Dinu
Roger Krause
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mahle International GmbH
Original Assignee
Mahle International GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mahle International GmbH filed Critical Mahle International GmbH
Publication of EP2438315A1 publication Critical patent/EP2438315A1/fr
Application granted granted Critical
Publication of EP2438315B1 publication Critical patent/EP2438315B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
    • F16C7/02—Constructions of connecting-rods with constant length
    • F16C7/023—Constructions of connecting-rods with constant length for piston engines, pumps or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
    • B21K1/766—Connecting rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/10—Construction relative to lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C9/00—Bearings for crankshafts or connecting-rods; Attachment of connecting-rods
    • F16C9/04—Connecting-rod bearings; Attachments thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/10—Connection to driving members
    • F16J1/14—Connection to driving members with connecting-rods, i.e. pivotal connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J7/00—Piston-rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2360/00—Engines or pumps
    • F16C2360/22—Internal combustion engines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49288—Connecting rod making

Definitions

  • the traditional internal combustion engine relies on connecting rods for transmitting combustion power from a piston main body to a crankshaft of the engine, thereby converting the linear motion of the piston main body to rotational motion at the crankshaft.
  • Combustion power is generated from the intermittent ignition of gasoline that is injected into the combustion chamber, which creates extreme pressures that are applied to the piston and connecting rod.
  • the interface between the piston pin bore of the connecting rod and the piston pin experiences continuous radial loads during operation, where only a limited amount of a lubricant may be available for lubricating the interface.
  • at least one lubrication recess may be provided along an inner surface of the piston pin bore.
  • the lubrication recess is created by machining an indentation into an inner surface of the piston pin bore of the connecting rod.
  • the machining process may be a separate manufacturing operation that occurs after the connecting rod piston pin bore has been created through a material forming operation, such as, for example, forging. Machining operations may add to the expense and the complexity of manufacturing the connecting rod.
  • a method comprising the following steps: providing a connecting rod blank, where the connecting rod blank includes a crankshaft end and a piston pin end; and forming a crankshaft pin recess in the crankshaft end of the connecting rod blank, a piston pin recess in the piston pin end, and at least one lubrication recess in the piston pin end of the connecting rod blank; and wherein the lubrication recess and the piston pin recess are both formed concurrently.
  • a piston pin 202 is received in the piston pin end 102 of the connecting rod 100, i.e., within piston pin bore 106, thereby generally securing the connecting rod 100 to the piston 200.
  • the piston 200 is assembled within a cylinder of an internal combustion engine.
  • An interface I between the piston pin bore 110 of the connecting rod 100 and the piston pin 202 typically experiences continuous radial loads from the piston pin 202 during operation.
  • the lubrication recesses 112 are provided in an effort to enhance lubrication between the piston pin 202 and the piston pin bore surface 110, as the lubrication typically accumulates within the lubrication recesses 112, thereby increasing the amount of lubrication at the interface I.
  • FIG. 1C is an enlarged view of the piston pin end or small end 102.
  • the piston pin bore surface 110 includes several lubrication recesses 112 that extend in this embodiment along only a portion of the longitudinal surface L such that each lubrication recess 112 intersects only one of the front face 114 and the rear face 116 of the piston pin end 102. That is, in this embodiment the lubrication recesses 112 do not generally extend into a central portion CP of the longitudinal surface L, where the central portion CP is illustrated as a plane intersecting the piston pin end 102.
  • the outer surface of the lubrication recesses 112 within the piston pin bore surface 110 are defined by the outer profile P of the lubrication recess 112.
  • the lubrication recess 112 includes a generally tapered contour C.
  • the contour C represents a boundary between the piston pin bore surface 110 and the outer profile P of the lubrication recess 112, where the contour C generally indicates the position of the lubrication recess 112.
  • the contour C of the lubrication recesses 112 is tapered inwardly, towards the central portion CP of the longitudinal surface L. That is, the contour C is formed at an inward angle IA, oriented towards the central portion CP.
  • FIGS. 1A and 1C illustrate the contour C of the lubrication recesses 112 having a generally tapered profile
  • the contour C may include other profiles as well.
  • the contour C includes a semi-circular profile.
  • the contour C is generally finished in a machining operation that removes material and creates a final finish of the piston pin bore surface 110. That is, the boundary between the piston pin bore surface 110 and the lubrication recess 112 is substantially defined in a machining operation. It should be noted that while the machining operation of the piston pin bore surface 110 generally defines the contour C, i.e., the boundary between the piston pin bore surface 110 and the lubrication recess 112, the outer profile P of the lubrication recess 112 remains generally unaffected, as the outer profile P is generally defined by the border between the front face 114 and the lubrication recess 112. In other words, a finishing or machining operation working upon the piston pin bore surface 110 alters the inner contour C while generally leaving the outer profile P unaffected.
  • FIG. 1C illustrates two lubrication recesses 112 located along the front face 114 generally disposed approximately one hundred and eighty degrees (180°) with respect to each other and two lubrication recesses 112 located along the rear face 116 also generally disposed approximately one hundred and eighty degrees (180°) with respect to each other, where the lubrication recesses 112 located at the front face 114 generally oppose the lubrication recesses 112 on the rear face 116.
  • the lubrication recesses 112 located at the front face 114 generally oppose the lubrication recesses 112 on the rear face 116.
  • the lubrication recesses 112 is also positioned at an angle A measured from a horizontal axis HA of the piston pin bore 106, where the horizontal axis HA is oriented generally perpendicular to the axis A-A of the connecting rod 100.
  • the angle A may be any angle up to about ninety degrees (90°) in either direction.
  • the lubrication recesses 112 may also be positioned such that the angle A is about zero degrees (0°), that is, the lubrication recesses 112 may be generally aligned with the horizontal axis HA.
  • the piston pin bore surface 110 is generally curved, where the piston pin bore surface 110 includes a substantially convex surface that is curved inwardly towards the piston pin bore center 118 when viewed along the longitudinal surface L. Including a longitudinal surface L that is substantially convex is advantageous, because the piston pin 202 (illustrated in FIG. 1B ) experiences some degree of bending during operation of the piston cylinder assembly 20. A generally curved longitudinal surface L accommodates at least a portion of the bending of the piston pin 202.
  • the piston pin bore surface 110 may also include an anti-friction coating applied along at least a portion of the piston pin bore surface 110.
  • At least the piston pin end 102 of the connecting rod 100 is constructed from a metal based material.
  • some metals that may be used include steel, aluminum, or titanium.
  • FIG. 1D a magnified illustration of one of the lubrication recesses 112 of the piston pin bore surface 110 illustrates a grain flow G.
  • the grain flow G are lines located at the surface of the lubrication recess 112 that indicate the orientation of the constituents of the metal when a forming process is used to create the lubrication recess 112.
  • FIG. 1D illustrates the grain flow G at the lubrication recess 112 oriented to generally correspond to the outer profile P. That is because the lubrication recess 112 is created by a metal forming process, such as, but not limited to, forging. Metal forming processes typically orient the grain flow G to follow the direction of metal deformation during the forming process. Including a grain structure G that generally follows the direction of metal deformation results in enhanced material properties, such as, for example, increased strength, ductility, resistance to impact, or fatigue. Creating the lubrication recess 112 by a metal working operation such as forging is advantageous, especially when compared to a material removal operation, such as machining.
  • a metal forming process such as, but not limited to, forging.
  • FIG. 1D illustrates the grain flow G as lines that are generally parallel to one another, and are substantially aligned to correspond with the outer profile P. Therefore, machining the outer profile P into the piston pin bore surface 110 would not typically result in the increased material properties that are experienced during forming.
  • FIG. 2A a connecting rod blank 100a is provided.
  • the connecting rod blank 100a includes a piston pin end blank portion 102a, a crankshaft end blank portion 104a, and a shaft blank portion 120a.
  • the connecting rod blank 100a is generally circular in cross-section, which is illustrated as cross section X C .
  • the connecting rod blank 100a also includes a generally uniform cross sectional width W 1 .
  • the connecting rod blank 100a is narrowed along the connecting rod blank 100a to form a shaft blank portion 120b of a connecting rod 100b.
  • At least a portion of the shaft blank portion 120b includes a narrower cross section, where the cross sectional width W 1 , illustrated in FIG. 2A , is generally reduced to a width W 2 in FIG. 2B .
  • the shaft blank portion 120b is narrowed by a roll forming operation that generally works directly upon at least a portion of the shaft blank portion 120b.
  • a connecting rod blank 100c having a generally quadrangular-sectioned piston pin end 102c and crankshaft end 104c.
  • This transitional shape results from a pre-forging operation that generally forms the connecting rod 100c to a quadrangular-sectioned shape that is generally between the initially round shape shown in FIGS. 2A and 2B , and the final quadrangular-sectioned shape of the connecting rod (e.g., as shown in the perspective view of FIG. 1A ).
  • the transitional shape shown in FIG. 2C allows a subsequent forging or other forming operation to more easily form a desired final shape of the connecting rod 100.
  • FIG. 2D a connecting rod blank 100d is illustrated after the forming of a piston pin end 102d and the crankshaft end 104d is generally complete, with the exception of initial recesses 106d, 108d.
  • the recesses 106d, 108d have a material flash such that the opening does not extend all the way through the piston pin end 102d or crankshaft end 104d in an axial direction. The material flash is thus subsequently removed to form the bores 106, 108.
  • the blank 100d also includes a material flash 400 generally extending about the perimeter of the connecting rod 100d. As shown in FIG.
  • the material flash 400 is generally disposed in a plane P F that is generally parallel with the longitudinal axis A-A of the connecting rod 100b.
  • the lubrication recesses 112d also are formed at the piston pin bore recess 106d concurrently with the recess 106d and located along a piston pin bore surface 110d.
  • the formation of the connecting rod 100 is thus generally complete in connecting rod blank 100d, with the exception of the material flash 400 and the material flash within recesses 106d and 108d.
  • FIG. 2E is an enlarged perspective view of the piston pin recess 106d, before the material flash within the recess 106d is removed.
  • the outer profile P of the lubrication recess 112 has been substantially defined by the forming of the piston pin end 102d. That is, the outer profile P of the lubrication recess 112 includes a final predetermined configuration.
  • the final predetermined configuration may be defined as the general overall outer profile P of the lubrication recess 112 included with the substantially complete connecting rod (illustrated in FIGs. 1A-1D and 2E ). That is, the final predetermined configuration of the lubrication recesses 112 is included with the connecting rod 100 assembled to the piston 200, such as the connecting rod and piston assembly illustrated in FIG. 1B .
  • the contour C may be altered or changed in a finishing or machining operation. Specifically, a machining operation removing material and creating the final finish of the piston pin bore surface 110 may still need to occur, thereby defining the contour C of the lubrication recesses 112, while generally not affecting the outer profiles P of the lubrication recesses 112.
  • the predetermined final configuration of the outer profile P is defined concurrently with the forming of the piston pin bore recess 106d.
  • FIG. 2F is an alternative illustration of a piston pin recess 106d', where generally circular depressions 150 are included within the material flash of the piston pin recess 106d'.
  • the circular depression 150 is formed concurrently during the same operation that creates the lubrication recesses 112d, and the recess 106d.
  • the overall shape of the depressions 150 defines at least a portion of the outer profile P' of the lubrication recesses 112'.
  • the depressions 150 facilitate the formation of at least a portion of the outer profile P' of the lubrication recesses 112'.
  • the depressions 150 may be substantially cone shaped indentations that extend into the piston pin recess 106d'.
  • the connecting rod 100 now has the material flash 400 and the material flash from recesses 106d and 108d (illustrated in FIG. 2D ) removed by a material removal process.
  • the material flash 400 and the material flash from recesses 106d and 108d that is removed may all be generally disposed in the plane P F (illustrated in FIG. 2D ).
  • the removal of the material flash from the recesses 106d and 108d is performed by a machining operation.
  • the piston pin bore 110 may then undergo a machining operation removing material and creating the final finish of the piston pin bore surface 110.
  • the machining operation may substantially define the contour C of the lubrication recesses 112, while the outer profile P of the lubrication recess 112 remains generally unaffected.
  • the piston pin bore surface 110 may also undergo a coating operation, where at least a portion of the piston pin bore surface 110 may be coated with an anti-friction coating.
  • the material removal process may define at least a portion of the contour C as well as the piston pin bore surface 110 (illustrated in FIG. 1C ), where the contour C represents the boundary between the piston pin bore surface 110 and the lubrication recess 112.
  • Process 300 generally begins at step 302 te and generally ends at step 312, where the connecting rod is initially produced or formed.
  • a connecting rod blank is provided.
  • the connecting rod blank 100a includes the piston pin end blank portion 102a, the crankshaft end blank portion 104a, the shaft blank portion 120a, and the generally uniform cross section X C .
  • Process 300 then continues to step 304.
  • the cross-sections of the connecting rod blank are generally narrowed at the shaft section.
  • a roll forming operation is employed to narrow a width W 1 of cross-section X C of the initial connecting rod 100a to a reduced width W 2 of the narrowed connecting rod 100b.
  • the roll forming operation is performed generally at or around at least a portion of the shaft blank portion 120b.
  • the narrowing of the shaft blank portion 120b also work hardens the material, thereby hardening and strengthening the narrowed portions of shaft blank portion 120b.
  • Process 300 then continues to step 306.
  • the crankshaft pin recess 108d is formed in the connecting rod blank.
  • the crankshaft pin recess 108d is formed in the second connecting rod blank 100a in a series of forging operations as shown in FIGS. 2B - 2D .
  • FIG. 2D illustrates the recesses 106d, 108d having the material flash such that the opening does not extend all the way through the piston pin end 102d or crankshaft end 104d in an axial direction.
  • Process 300 then continues to step 308.
  • the piston pin recess 106d and the at least one lubrication recess 112d are formed concurrently in the piston pin end 102d of the connecting rod blank 100d.
  • the piston pin recess 106d and the at least one lubrication recess 112d are formed in the second connecting rod blank 100a in a series of forging operations as shown in FIGS. 2B - 2D .
  • the lubrication recess 112d includes an outer profile P having a final predetermined configuration, where the predetermined final configuration of the outer profile P is substantially defined by forming the lubrication recess 112.
  • the piston pin end 102d and the crankshaft end 104d are generally complete, with the exception of material flash such that the opening does not extend all the way through the piston pin end 102d and the crankshaft end 104d in an axial direction.
  • the step 308 of forming the piston pin recess 106d and the lubrication recess 112d may be a separate forming operation from the step 306 of forming the piston crankshaft recess 108d.
  • the step 308 of forming the piston pin recess 106d and the lubrication recess 112d may be included in the step 306 of forming of the piston crankshaft bore 108d. Process 300 then continues to step 310.
  • step 310 the material flash within the openings of the piston pin recess 106d and the crankshaft recess 108d are removed.
  • the connecting rod blank 100d is generally complete, with the exception of initial recesses 106d, 108d.
  • the recesses 106d, 108d have a material flash such that the opening does not extend all the way through the piston pin end 102d or crankshaft end 104d in an axial direction.
  • the material flash is thus subsequently removed to form the bores 106, 108.
  • the piston pin bore 106 and the crankshaft pin bore 108 are machined to remove the material flash from the openings 106d and 108d, although it is understood that other approaches may be used as well.
  • the piston pin bore 106 is formed in the connecting rod 100 by any combination of forming operations, such as forging operations.
  • the piston pin bore 106 may be generally formed in a series of forging operations such as hot forging. Any other method for forming piston pin bores may be employed.
  • the steps 304, 306, 308 also generally shape an initially round or circular cross-section of the connecting rod blanks 100a into a generally quadrangular cross-section.
  • any of the forging, rolling, or other operations described herein work a perimeter of the connecting rod blanks about the shaft 120, thus shaping an initially round cross-section of the blanks (e.g., as best seen in FIG. 2A ) to a generally quadrangular cross section defining at least four generally flat sides.
  • the round cross-section initially present at FIG. 2A is shaped into a generally I-shaped cross-section X F typical of connecting rods, as seen in FIG. 1A .
  • Other examples of generally quadrangular cross-sections may include those that are generally square, generally rectangular, or the like.
  • a material flash 400 is removed from a perimeter of the connecting rod blank 100 after the narrowing operation.
  • the material flash 400 as seen best in FIG. 2D , is generally disposed in a flash plane P F that includes the longitudinal axis A.
  • the flash plane P F typically extends along an entire length of the pre-formed connecting rod blank, e.g., connecting rod blank 100d.
  • Process 300 then continues to step 314.
  • step 314 the piston pin bore surface 110 undergoes a finishing operation, where material is removed, e.g., by machining, from the piston pin bore surface 110.
  • a finishing operation where material is removed, e.g., by machining, from the piston pin bore surface 110.
  • the contour C that represents the boundary between the piston pin bore surface 110 and the lubrication recess 112 is substantially defined in a finishing operation that removes material from the piston pin bore surface 110.
  • the outer profile P of the lubrication recesses 112 is generally not affected by any subsequent machining operations, such that the predetermined final configuration of the outer profile P that was substantially defined by forming of the lubrication recess 112, e.g., in step 308, remains generally the same.
  • a connecting rod is assembled with a piston.
  • the connecting rod 100 be is assembled to a piston body 200 with the piston pin 202.
  • the connecting rod 100 is formed using a process 300 that requires little, if any, additional operations to the lubrication recesses 112 after forming. That is, the lubrication recesses 112 can be formed such that a separate machining operation is not needed to further define or establish the outer profile P of the lubrication recess 112. Omitting a machining operation to the lubrication recesses 112 reduces the complexity in manufacturing of the connecting rod.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Claims (15)

  1. Procédé de fabrication d'une bielle, comprenant :
    une étape de fourniture d'une ébauche de bielle (100),
    où l'ébauche de bielle comprend
    une extrémité de vilebrequin (104) et une extrémité de tige de piston (102) ; et
    une étape de formation d'une cavité (122) de tige de vilebrequin dans l'extrémité de vilebrequin de l'ébauche de bielle, une cavité (106) de tige de piston dans l'extrémité de tige de piston,
    caractérisé par le fait qu'au moins une cavité (112) de graissage est formée dans l'extrémité de tige de piston de l'ébauche de bielle ; et
    la cavité (112) de graissage et la cavité (106) de tige de piston sont toutes deux formées simultanément.
  2. Procédé selon la revendication 1, ladite au moins une cavité (112) de graissage comportant un profil extérieur comprenant une configuration finale prédéterminée, et définissant sensiblement la configuration finale prédéterminée du profil extérieur de ladite au moins une cavité de graissage par l'étape de formation de la cavité de tige de piston.
  3. Procédé selon la revendication 1, comprenant en outre une dépression (150) de forme générale circulaire à l'intérieur de la cavité de tige de piston, la dépression (150) définissant une de ladite au moins une cavité (112) de graissage et formant au moins une partie du profil extérieur de la cavité de graissage.
  4. Procédé selon la revendication 1, comprenant en outre :
    une étape d'enlèvement d'un matériau de bavure de tige de piston et d'un matériau de bavure de tige de vilebrequin de la cavité (106) de tige de piston et de la cavité (122) de tige de vilebrequin, créant ainsi un alésage de tige de piston et un alésage de tige de vilebrequin.
  5. Procédé selon la revendication 4, dans lequel l'enlèvement du matériau de bavure de tige de piston et du matériau de bavure de tige de vilebrequin comprend l'usinage de la cavité (106) de tige de piston et de la cavité (122) de tige de vilebrequin.
  6. Procédé selon la revendication 4, comprenant en outre :
    une étape de revêtement d'au moins une partie d'une surface intérieure (110) de l'alésage de tige de piston avec un revêtement antifriction.
  7. Procédé selon la revendication 1, comprenant en outre :
    une étape d'enlèvement d'un matériau de bavure d'un périmètre de l'ébauche de bielle (100).
  8. Procédé selon la revendication 1, comprenant en outre :
    une étape de rétrécissement d'une section transversale de l'ébauche de bielle (100) à une section de tige (120) la section de tige connectant l'extrémité du vilebrequin (104) à l'extrémité de la tige de piston (102).
  9. Procédé selon la revendication 1, dans lequel la cavité (106) de tige de piston, la cavité (122) de tige de vilebrequin et la au moins une cavité (112) de graissage sont formées par forgeage.
  10. Procédé de fabrication d'un assemblage de piston, comprenant :
    une étape de fabrication d'une bielle, comprenant :
    une étape de fourniture d'une ébauche de bielle (100), où l'ébauche de bielle (100) comprend une extrémité de vilebrequin (104) et une extrémité de tige de piston (102), et
    une étape de formation d'une cavité (122) de tige de vilebrequin dans l'extrémité du vilebrequin (104) de l'ébauche de bielle (100), une cavité (106) de tige de piston dans l'extrémité de tige de piston (102) de l'ébauche de bielle (100), et au moins une cavité de graissage (112) à une surface intérieure (110) de la cavité de tige de piston, dans lequel ladite au moins une cavité (112) de graissage comprend un profil extérieur (P) comprenant une configuration finale prédéterminée ;
    une étape d'assemblage de la bielle (100) à un piston (200), la bielle (100) comprenant la configuration finale prédéterminée du profil extérieur; et
    une étape de définition sensible de la configuration finale prédéterminée du profil extérieur (P) de ladite au moins une cavité (112) de graissage au cours de l'étape de formation de la cavité de graissage,
    dans lequel le procédé comprend en outre.
    une étape de formation de ladite au moins une cavité de graissage (112) et de la cavité (106) de tige de piston simultanément.
  11. Procédé selon la revendication 10, comprenant en outre :
    l'étape d'inclusion d'une dépression (150) de forme générale circulaire à l'intérieur de la cavité de tige de piston, la dépression définissant au moins une partie du profil extérieur (P) de la cavité de graissage.
  12. Procédé selon la revendication 10, comprenant en outre :
    une étape d'élimination d'un matériau de bavure de tige de piston et un matériau de bavure de tige de vilebrequin de la cavité (106) de tige de piston et de la cavité (122) de tige de vilebrequin pour créer un alésage de tige de piston et un alésage de tige vilebrequin.
  13. Procédé selon la revendication 12, dans lequel l'enlèvement du matériau de bavure de tige de piston et du matériau de bavure de tige de vilebrequin comprend l'usinage de la cavité (106) de tige de piston et de la cavité de tige de vilebrequin.
  14. Procédé selon la revendication 12, comprenant en outre :
    une étape de revêtement d'au moins une partie d'une surface interne (110) de l'alésage de tige de piston avec un revêtement antifriction.
  15. Procédé selon la revendication 10, comprenant en outre :
    l'étape d'enlèvement d'un matériau de bavure d'un périmètre de l'ébauche de bielle.
EP10722010.5A 2009-06-02 2010-05-28 Cavité de graissage de bielle Not-in-force EP2438315B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/476,337 US20100300397A1 (en) 2009-06-02 2009-06-02 Connecting rod lubrication recess
PCT/EP2010/003262 WO2010139431A1 (fr) 2009-06-02 2010-05-28 Cavité de graissage de bielle

Publications (2)

Publication Number Publication Date
EP2438315A1 EP2438315A1 (fr) 2012-04-11
EP2438315B1 true EP2438315B1 (fr) 2016-08-17

Family

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EP10722010.5A Not-in-force EP2438315B1 (fr) 2009-06-02 2010-05-28 Cavité de graissage de bielle

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US (1) US20100300397A1 (fr)
EP (1) EP2438315B1 (fr)
CN (1) CN102459934A (fr)
BR (1) BRPI1010032B1 (fr)
WO (1) WO2010139431A1 (fr)

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USD904754S1 (en) * 2018-11-30 2020-12-15 William Prym Gmbh & Co. Kg Pompon maker

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Also Published As

Publication number Publication date
WO2010139431A1 (fr) 2010-12-09
BRPI1010032B1 (pt) 2021-09-14
US20100300397A1 (en) 2010-12-02
EP2438315A1 (fr) 2012-04-11
BRPI1010032A2 (pt) 2020-08-18
CN102459934A (zh) 2012-05-16

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